In general, then, an object of mass m moving with speed v has kinetic energy. With finish machining, positive rake inserts are usually selected to get a better surface finish. Work done on a system represents energy that is transferred into or out of. negative rake inserts are best suited for rough machining since they can absorb cutting forces which allows higher cutting speeds. Different levels of roughness make different demands on the inserts and cutting angles. total work done.1 answer Top answer: The correct option is C acceleration of the block nbsp Due to relative motion between observers, they will find the block moving the different speeds. Finishing or fine machining can provide high dimensional accuracy and close tolerance while roughing can’t.Ħ. They observe a block of mass m moving a distance l on a rough surface. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. The surface quality after finishing is better than that after roughing.ĥ. The material removal rate in roughing process is higher than finishing.Ĥ. Higher feed rate and cut depth are applied in roughing.ģ. Roughing is mainly to remove a large amount of excess material from the piece, finishing is to improve surface finish, tolerance, and reduce or minimize the errors.Ģ. Hence, the force FmgsinA must be applied. How much work is done To push an object up a smooth inclined plane, one must overcome the force of gravity which causes the object to slide down the plane. Assume that you are exerting a constant force in the upward direction and that you are moving the object upward with uniform velocity. Therefore the angle between the frictional force and displacement is 180°. Here, the frictional force is opposite to the applied force and hence, is opposite to the displacement. At a certain point it has a speed v m/s and it comes to a stop after traveling 32 m. (A) 16 m/s (B) 26 m/s (C) 38 m/s Question: An object of mass m is moving on a horizontal rough surface. What’s the specific difference between roughing and finishing?ġ. Suppose an object is pushed up a smooth inclined plane from ground level to a point h above the ground with force F. Assume you are lifting an object with mass 20 kg from the ground to a height of 1.5 m. When an object is moving on a Rough surface Kinetic Frictional forces tries to resist the Movement. If the coefficient of friction between the object and the surface is 0.40, what is the value of speed v Use g 10 m/s2. The roughing operation is used to produce a part geometry close to the shaped of finished product in a short time, and the finishing operation is performed after roughing to achieve the final geometry and other details. A block of mass 10 kg is moving with constant velocity 10m/s in rightward direction on a rough horizontal surface with a force of 50N acting on it. Conventional machining processes are suitable for high stock removal and good surface quality, which involves two stages or two kinds of processes. Determine the work done by Andrew for two times circular motion. Andrew pushes an object with force of 20 N so the object moves in circular motion with a radius of 7 meters. We express the relation between work done and the time interval involved in doing it, by introducing the concept of power.To meet the basic requirement of CNC machining, a number of operations need to be performed in the machine shop, including turning, milling, facing, and more. B ased on the above formula, work done by force and there is a displacement. In the chapter-opening figure, several sprinters may have achieved the same velocity at the finish, and therefore did the same amount of work, but the winner of the race did it in the least amount of time. None of these quantities or relations involves time explicitly, yet we know that the time available to accomplish a particular amount of work is frequently just as important to us as the amount itself. The concept of work involves force and displacement the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. Find the power expended by a force acting on a moving body.Relate the work done during a time interval to the power delivered.By the end of this section, you will be able to:
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